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Compiling names of serial killers What is a serial killer? 2 or more victims (this is a change in definition) 2 separate events Cooling off period in between Determine whether person is actually a serial killer or a Spree killer Mass killer None of the above We eliminated 473 people found on common serial killers lists that are not actually serial killers Issues What to do with people who have killed once and clearly would have killed again had they not been caught? What about a person with one kill and nine attempts? Gathering Information Information Obtained (141 variables) Demographics (age, sex, race, country, state, city) Childhood info Birth order, raised by, teased, abused Education and IQ Vocational and military history Criminal and forensic record Information about the crime Method, victim, location, partner Information about the trial NRGI, sentence, confession, New Section on Victims Names & dates Excellent check for data accuracy and will be useful in studying victims rather than killers Information on 7,400 U.S. Victims to date. • Age at the start of the series • Potential problems • Should we use age at first kill rather than first kill in series? • 6% killed prior to the start of the series • Should we use age at first attempted murder • Many of the older serial killers spent time in prison prior to their series • Simple descriptive statistics • Mean = 28.4 (SD = 9. Cursor Pointer For Windows 8. 3) • Median = 27 • Youngest = 9 (Robert Dale Segee, final kill was at age 21) • Oldest = 72 (Ray Copeland) • Only 27.5% actually fall into their mid-to-late 20’s (24 – 29) Updated.